Difficulty: Medium
Average Score: 71%
Full-length
If both parents are carriers of the defective gene for a disease with an autosomal recessive inheritance, what percentage chance does each child have of inheriting the gene from both parents and developing the disorder? Report your answer using a whole number.
Correct answer
25
Rationale
Autosomal recessive inheritance: Each parent has a 50% chance of passing the defective gene, so the child's chance is 0.5 X 0.5 = 0.25 or 25%.